Circuit audio power amplifier of 68 watts using lm3886
The lm3886 is an integrated circuit very used in projects of audio amplifiers by that it can be found with more easiness.
see that the circuit should be fed by source symmetrical good filtered of + 34 and – 34 volts. R2 and L1 is a resistor of 10 ohms / 2watt coiled with 10 to 12 you exhale of enameled thread AWG 20. The circuit integrated lm3886 is a component easy of being found at the electronics stores, for that he is used in several projects of potency audio, some exist circuits with linked lm3886 in bridges for potencies of up to 150 watts. For most information on the assembly of that circuit, I suggest that sees the datasheet of the lm3886 in the site of the national semiconductors. With the information of the leaf of data you can adapt the circuit with lm3886 your needs.
Suggestion of printed circuit board for assembly of the power amplifier
Board for assembly seen beside the components power amplifier lm3886
Lists of components for assembly of the power amplifier
R1 10K Ohms
R2 10 Ohms 2W see text
R3 10 Ohms
R4 47K Ohms
R5 220K Ohms
R6 10K Ohms
R7 100K Ohms
L1 0,7uH see text